C# String IndexOf(Char)

Description

String IndexOf(Char) reports the zero-based index of the first occurrence of the specified Unicode character in this string.

Syntax

String.IndexOf(Char) has the following syntax.

public int IndexOf(
  char value
)

Parameters

String.IndexOf(Char) has the following parameters.

• value - A Unicode character to seek.

Returns

String.IndexOf(Char) method returns The zero-based index position of value if that character is found, or -1 if it is not.

Example

The following example demonstrates how you can search a String for a character using the IndexOf method.

//from   www  . j a v a 2  s. c  om
using System;
public class MainClass{
  public static void Main(String[] argv){  
    String szGreekAlpha = new String('\u0391',5);
    String szGreekOmega = new String(new char [] {'\u03A9','\u03A9','\u03A9'},2,1);
    
    String szGreekLetters = String.Concat(szGreekOmega, szGreekAlpha, szGreekOmega.Clone());
    
    int ialpha = szGreekLetters.IndexOf('\u0391');
    
    int iomega = szGreekLetters.LastIndexOf('\u03A9');
    
    Console.WriteLine(ialpha);
    Console.WriteLine(iomega);
  }
}
    

The code above generates the following result.